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author | Tharun Kumar P <tharunkumar.pasumarthi@microchip.com> | 2022-10-06 08:05:14 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2022-11-29 19:59:11 +0300 |
commit | 7ba63521a1e9d8ca6fb55ead19e6e2b850b8fd80 (patch) | |
tree | 456ac73decb11a2d88e02707b6b84ad26d9bfc12 /drivers/spi/spi-pci1xxxx.c | |
parent | c771b4eabd6a52afff0b6f01c361a9d04fa8cd9d (diff) | |
download | linux-7ba63521a1e9d8ca6fb55ead19e6e2b850b8fd80.tar.xz |
spi: microchip: pci1xxxx: Add suspend and resume support for PCI1XXXX SPI driver
Implement suspend, resume callbacks, store config at suspend and restore
config at time of resume
Signed-off-by: Tharun Kumar P <tharunkumar.pasumarthi@microchip.com>
Link: https://lore.kernel.org/r/20221006050514.115564-3-tharunkumar.pasumarthi@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-pci1xxxx.c')
-rw-r--r-- | drivers/spi/spi-pci1xxxx.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/spi/spi-pci1xxxx.c b/drivers/spi/spi-pci1xxxx.c index 958503a4d911..a31c3b612a43 100644 --- a/drivers/spi/spi-pci1xxxx.c +++ b/drivers/spi/spi-pci1xxxx.c @@ -57,6 +57,9 @@ #define SPI_CHIP_SEL_COUNT 7 #define VENDOR_ID_MCHP 0x1055 +#define SPI_SUSPEND_CONFIG 0x101 +#define SPI_RESUME_CONFIG 0x303 + struct pci1xxxx_spi_internal { u8 hw_inst; bool spi_xfer_in_progress; @@ -383,10 +386,85 @@ error: return ret; } +static void store_restore_config(struct pci1xxxx_spi *spi_ptr, + struct pci1xxxx_spi_internal *spi_sub_ptr, + u8 inst, bool store) +{ + u32 regval; + + if (store) { + regval = readl(spi_ptr->reg_base + + SPI_MST_CTL_REG_OFFSET(spi_sub_ptr->hw_inst)); + regval &= SPI_MST_CTL_DEVSEL_MASK; + spi_sub_ptr->prev_val.dev_sel = (regval >> 25) & 7; + regval = readl(spi_ptr->reg_base + + SPI_PCI_CTRL_REG_OFFSET(spi_sub_ptr->hw_inst)); + regval &= SPI_MSI_VECTOR_SEL_MASK; + spi_sub_ptr->prev_val.msi_vector_sel = (regval >> 4) & 1; + } else { + regval = readl(spi_ptr->reg_base + SPI_MST_CTL_REG_OFFSET(inst)); + regval &= ~SPI_MST_CTL_DEVSEL_MASK; + regval |= (spi_sub_ptr->prev_val.dev_sel << 25); + writel(regval, + spi_ptr->reg_base + SPI_MST_CTL_REG_OFFSET(inst)); + writel((spi_sub_ptr->prev_val.msi_vector_sel << 4), + spi_ptr->reg_base + SPI_PCI_CTRL_REG_OFFSET(inst)); + } +} + +static int pci1xxxx_spi_resume(struct device *dev) +{ + struct pci1xxxx_spi *spi_ptr = dev_get_drvdata(dev); + struct pci1xxxx_spi_internal *spi_sub_ptr; + u32 regval = SPI_RESUME_CONFIG; + u8 iter; + + for (iter = 0; iter < spi_ptr->total_hw_instances; iter++) { + spi_sub_ptr = spi_ptr->spi_int[iter]; + spi_master_resume(spi_sub_ptr->spi_host); + writel(regval, spi_ptr->reg_base + + SPI_MST_EVENT_MASK_REG_OFFSET(iter)); + + /* Restore config at resume */ + store_restore_config(spi_ptr, spi_sub_ptr, iter, 0); + } + + return 0; +} + +static int pci1xxxx_spi_suspend(struct device *dev) +{ + struct pci1xxxx_spi *spi_ptr = dev_get_drvdata(dev); + struct pci1xxxx_spi_internal *spi_sub_ptr; + u32 reg1 = SPI_SUSPEND_CONFIG; + u8 iter; + + for (iter = 0; iter < spi_ptr->total_hw_instances; iter++) { + spi_sub_ptr = spi_ptr->spi_int[iter]; + + while (spi_sub_ptr->spi_xfer_in_progress) + msleep(20); + + /* Store existing config before suspend */ + store_restore_config(spi_ptr, spi_sub_ptr, iter, 1); + spi_master_suspend(spi_sub_ptr->spi_host); + writel(reg1, spi_ptr->reg_base + + SPI_MST_EVENT_MASK_REG_OFFSET(iter)); + } + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(spi_pm_ops, pci1xxxx_spi_suspend, + pci1xxxx_spi_resume); + static struct pci_driver pci1xxxx_spi_driver = { .name = DRV_NAME, .id_table = pci1xxxx_spi_pci_id_table, .probe = pci1xxxx_spi_probe, + .driver = { + .pm = pm_sleep_ptr(&spi_pm_ops), + }, }; module_pci_driver(pci1xxxx_spi_driver); |